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I’m having the same problem with my ’88 Celica - on and off operation
of heat regardless of control settings at high. I believe there’s a
vacuum assist to the system that could cause the problem. Has anyone
run into this?

"Roy" wrote:[color=blue]
> Vinnie, Did you ever find out what the problem is (was)? I am
> having pretty much the same issue on an 87 Celica, it also has
> the cableless control unit. I have had the radiator flushed
> twice within a week to see if it was a clogged heater core. No
> change, I disconnected the wire that controls the heater core
> bypass valve so it is always open. I never could find the
> blend door so that remains an issue but I am curious about
> what you found out with the electronic control assy. Did it
> solve you problem initially?? Have you changed any of the
> heater solenoids?
> Thx,
> Roy[/color]